Good question. Nothing happens when I try to control it, even if I'm right in front of the sensor. It's clearly picking up my signal (flashes when I press a button), but it doesn't control the box.
Edit: I should clarify: The system intermittently controls the box I want to control, but sometimes it doesn't, and even when it does, it only does it if I have the remote literally no more than a foot away from the receiver. In fact, the only time the receiver blinks to acknowledge me pressing the button is when I'm that close to it.
Batteries have been charging for about 24 hours.